Heat Capacity and Enthalpy of Formation of Trimethyl Phosphite, 2-Chloromethylbenzonitrile, and 2-Dimethylphosphonomethylbenzonitrile
作者:Xin-gang Xu、Zuo-xiang Zeng、Wei-lan Xue、Hai-ying Zhang
DOI:10.1021/je060445o
日期:2007.7.1
The heat capacities, Cp, of trimethyl phosphite, 2-dimethylphosphonomethylbenzonitrile, and 2-chloromethylbenzonitrile are measured with an adiabatic calorimeter, and the standard enthalpies of formation, ΔfHo(298.15 K) (l or cr), for the three substances are determined. For this purpose, Cp(T) values of trimethyl phosphite and 2-dimethylphosphonomethylbenzonitrile are measured in the temperature range
用绝热量热计测量亚磷酸三甲酯,2-二甲基膦酰基甲基苄腈和2-氯甲基苄腈的热容量C p,以及这三个样品的标准形成焓Δf H o(298.15 K)(l或cr)。确定了物质。为了这个目的,Ç p(Ť)亚磷酸三甲酯和的值2-dimethylphosphonomethylbenzonitrile在温度范围内测得由(298.15到350.32)K,并且Ç p(Ť)分别获得了晶体(300.35至329.00 K)和液体(337.26至372.45 K)的2-氯甲基苄腈曲线。实验热容量与相应的平滑值之间的偏差在±1.5%之内。从2-氯甲基苄腈的C p(T)曲线发现熔融转变现象,并用差示扫描量热仪(DSC)测量熔融焓。三种化合物的气相标准生成焓Δf H o(g,298.15 K)通过Benson基团加成法进行评估。临界温度T c,临界压力P c,并且还通过不同的基团添加方法计算化合物的蒸发焓Δvap H